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CAS NO.: 56663-76-4; 2,2-dimethyl-but-3-ynoic acid. PROPERTIES: This substituted acetylenic acid features two methyl groups on a but-3-ynoic acid framework, creating a molecule with potential applications in organic synthesis and materials science. The 2,2-dimethyl-but-3-ynoic acid typically appears as a colorless to pale yellow liquid with moderate solubility in common organic solvents. Its molecular structure includes a triple bond and methyl groups that influence the electronic properties and reactivity of the molecule. For optimal stability and to prevent premature reactions, this compound should be stored at 2-8 degree Celsius in an amber glass bottle under an inert atmosphere. When handling, appropriate safety measures including nitrile gloves and safety goggles are recommended. This compound is sensitive to light and moisture, requiring careful environmental control during storage and use. In case of skin contact, wash thoroughly with soap and water; if eye contact occurs, rinse immediately and seek medical evaluation. APPLICATIONS: The 2,2-dimethyl-but-3-ynoic acid serves as a versatile building block in organic synthesis, particularly for creating acetylenic bioactive molecules. The triple bond provides a handle for further functionalization through reactions such as hydrogenation or alkylation. In medicinal chemistry, this compound functions as an intermediate for developing pharmaceuticals targeting enzyme inhibitors and receptor modulators. The methyl groups contribute to target binding affinity and selectivity. Additionally, the molecule finds utility in materials science as a monomer for creating polymers with specific electronic and optical properties. Researchers utilizing this compound can benefit from its functional group versatility, enabling the development of diverse molecular architectures for applications ranging from drug discovery to advanced materials.